Ok. How close to the first null-point? Looks like zenith is a bit off.The white noise track, track 2 side B
Track 2, starts at 140mm. Nullpoint should be 120.9 Never got it to match to 0 L R phase difference anywhere. Stylus maximum turned tip towards centre.( Clockwise seen from above)Ok. How close to the first null-point? Looks like zenith is a bit off.
My main cartridge is an Audio Technica AT33PTG/II, but I also have an Audio Technica VM750SH, which has quite a large spike around 10-12 kHz.Yes, it is a terrible thing for a stylus to be too "pointy"....
From what magazine is this test of the OMA and SAT?I stumbled upon some speed measurement of these very expensive DD TT. They are beaten by a typical Technics 1200…and my Gyro and my Denon 51F
Money does not always matter…
· J. · OMA K3: $363,000 including power supply and Schröder SLM tonearm · SAT XD1: €180,000 without tonearm
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I have not had time to test myself but I will. From the zoomed in wave-form you should should get silence when combined to mono if the track is well done. Thinking about it a bit more it can be related to azimuth or zenith. Same with the other table/cartridge?Track 2, starts at 140mm. Nullpoint should be 120.9 Never got it to match to 0 L R phase difference anywhere. Stylus maximum turned tip towards centre.( Clockwise seen from above)
Left channel arrives a bit before right, but not sure how to calculate angle error…
The expected error at 140mm would be -1 to -1.5 degree…?
Tonearm tracking error and distortion
In the last posting, I reviewed the math for calculating the tracking error for a radial tonearm. The question associated with this is “who cares?” In the March, 1945 issue of Electroni…www.tonmeister.ca
? Ok?
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Yes, Framer (and many others) absolutely does that. Although I didn't bother to look it up now, I do remember reading Framer going on about how OMA had done blind tests of its speed stability, and differences of fractions of a second so small that it couldn't be measured made an audible difference - although I'm not necessarily convinced by yet another story from him (or from OMA), as he's been doing nothing but telling stories for 40 years. He could win the Nobel prize in literature for all the fictional stories he has come up with.Stereophile.
Fremer makes many statements about TT that are the direct opposite of what objective measurements tell, and he is not alone. Stereophile and other magazines could easily publish Shaknspin data for any turntable tested. But I don’t think they avoid it to not embarrass the TT makers and loose income. Most TT especially high end boutique brands are really mediocre regarding speed stability. Even well know high end tables are crap if you measure them. The exceptions are SME and Reed, Technics , are a few Rega models are good if using the most expensive belt. Check out Hifi news lab data
Do I understand you correctly that you don't have direct experience with that particular test tone record I referred to?View attachment 386837I have managed to measure record WF and phone apps and overlay the results with a good match.
Shaknspin is good but not perfect. It is very good at making repeatable and consistent results. I can extract the data via Bluetooth to excel and plot it there.That is really useful for analysis.
It has 3 minor flaws.
1.To much noise so the jitter and high and low speed deviation are exaggerated . Can be solved by making a filter in excel or make a moving average.
2. 33.33 on my DD and strobe disk is reported as 33.42 on Shaknspin. It can be calibrated but that only sets whatever average speed you have to 33.33. I simply just adjust TT for 33.42.
3.The FFT plot on the display should have had a log scale in linear, it makes the FFT values to crowded to see.
4. Sometimes the DIN WF values are calculated so low that are hard to believe 0.005..
Still it is a fantastic tool to optimize and check TT rpm stability.
Most test record WF tracks are crap due to uncentered records and such. Shaknspin in calibrated shape is much better. But test records can tell more about other TT problems..
These two phone apps are the best. Thanks to them I could tune my TT from a peak wow 2S of 0.2% to 0.05…..
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The Regas benefit greatly from the new super reference ELBT belts or whatever the name is. That is a must to have. you could also try the talcum trickThanks for your explanation. It sounds like something I wouldn't be able to do with my Rega, but it was interesting nonetheless, and I'm happy to hear that you were able to improve upon it.
As for the Dr. Feickert 7" record, I've heard stories of some people getting a really poorly pressed copy, but most copies are essentially perfectly made, as far as I understand.
So, it seems like both the apps and the test records have their benefits and downsides, as the apps are also dependent on the phones and the built-in gyroscopes, etc.
Thanks for your suggestion.The Regas benefit greatly from the new super reference ELBT belts or whatever the name is. That is a must to have. you could also try the talcum trick